Visual marker system

ABSTRACT

A pyrotechnic device for rapid delivery of a chemical payload by an aerial vehicle has a double container construction. An inner can carries the pyrotechnic chemical and releasable lid therefor. An outer can, attached to the hull of the vehicle, provides mounting for the inner can and its release mechanism.

Elmiiefi ames Faiem 1 1 1111 3,757,633

Salzman et al. 1 Sept. El, 3973 VlSUAL MARKER SYSTEM 3,430,533 3 1969 Kifor et al 89/l.5 R 3 626,415 121971 M 1 89 1.5 R x [751 Paul 531mm, Beach; Paul 2953 064 91960 Glggsr nz r l e zal is9 1.s R S p both of 3,323,544 6/1967 Francis 102 24 110 x Callf- 3,382,800 5/1968 Biggs, Jr 102 24 HC x [73] Assignee: The United States of! America, as

represented by the Secretary of the Navy, Washington, DC.

[22] Filed: Dec. 39, 1971 [21] Appl. N0.: 214,249

Primary ExaminerSamuel W. Engle Attorney-Richard S. Sciascia et al.

[57] ABSTRACT [52] CI 89/15 89/15 244/137 R A pyrotechnic device for rapid delivery of a chemical [51] int. Cl 36% M04 payload by an aerial vehicle has a double container [58] [Field of Search 89/l.5 R; 102/24 HC;

construction. An inner can carries the pyrotechnic 244/ 1371 138 chemical and releasable lid therefor. An outer can, at-

tached to the hull of the vehicle, provides mounting for [56] References Cited the inner can and its release mechanism.

1 UNITED STATES PATENTS 2,344,957 3/1944 Anzalone 102/34.4 -6 Claims, 4 Drawing Figures PATENTED SEN I973 SHEEI 1 BF 2 VISUAL MARKER SYSTEM STATEMENT OF GOVERNMENT INTEREST FIELD OF THE INVENTION This invention relates to the rapid ejection of payloads from vehicles, thereby providing delivery thereof. More particularly, but not by way of limitation, this invention relates to a method and system for deployment of chemical payloads from aerial missile type vehicles. For purposes of simplicity and ease of understanding, this invention will be described as it relates to the ejection of a single chemical canister which, again for propaedeutic explanation, will be described as a pyrotechnic marker to provide a visual indication of the detonation point of an aerial missile. In still greater particularity, the invention relates to an improved explosive ejection method and device to permit rapid deployment of the chemical payload without explosive damage thereto.

DESCRIPTION OF THE PRIOR ART Prior art attempts to deliver chemical packages from remotely controlled vehicles to distant points have taken a variety of approaches. In some instances, sprays and solid materials have been released from vehicles in flight. The compromise of control of the aerial vehicle is low altitude operation and the control of the chemical dispersed into the atmosphere above desired areas have resulted in systems and devices which have been, in charitable terms, only a qualified success.

A more appealing concept, for the localized application of chemical payloads at remote locations, involves landing the vehicle and releasing the chemical material from a fixed position. Many applications for such a delivery system are readily foreseeable, the treatment of plant diseases in remote locations which have been located from high altitude or orbitary satellite photographs, the combatting of localized ecological imbalances such as the red tides, and the visual location of impact areas of missiles fired for other purposes. However, the prior art devices for these purposes have, heretofore, lacked the refinement of even the aforedescribed aerial dispersion delivery systems.

Previous attempts at achieving these desirable results have met with the most limited success. The mechanical shock and strain necessarily accompanying the flight and impact velocities of the delivery missile have havocked the chemical payload packages. The warheads, in the case of ordnance missiles, have caused destruction and dislocation of the packages when they have been released too soon. The packages have become buried in the ground and in the debris at the impact site when release was too late. Furthermore, the control surfaces, i.e. fins of the delivery missiles have frequently interfered with the release of units of the prior art devices.

SUMMARY OF THE INVENTION An outer receptacle which fits internally within the delivery missile and explosively ejected inner container which fits within the outer container and has an outer surface which is contiguous and coextensive with the outer surface of the delivery missile. The inner can provides compartments to contain pyrotechnic material. A cover fitted over said inner can is attached thereto such 7 that it is explosively removed when the inner can is ejected from the receptacle. A detonation system also is a component part of the invention which explosively ejects said inner can from said receptacle and ignites the pyrotechnic material carried therein.

STATEMENT OF THE OBJECTS OF THE INVENTION In view of the foregoing discussion, it is an object of this invention to provide an improved payload delivery system.

A further object of this invention is to provide for an explosively ejected delivery package.

A further object of this invention is to provide for an explosively ejected chemical delivery package.

A further object of this invention is to provide a delivery system for ejection from an aerial missile upon landing.

Another object of this invention is to provide an explosively ejected pyrotechnic chemical delivery system for use with aerial vehicles.

Another object of this invention is to provide an improved system for the dispersion of chemicals carried by means of aerial vehicles.

Yet another object of this invention is to provide for a marker system to indicate the point of impact of any vehicle, such as an aerial missile, from a remote observation point.

Still another object of this invention is to provide an improved disposable container system for chemical materials.

These and other objects of the invention will become more readily apparent from the ensuing specification when taken with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top plan view of the device of the invention;

FIG. 2 is a sectional view of the device of the invention taken along lines 2-2 of FIG. 1;

FIG. 3 is a sectional view of a subassembly of the invention taken along lines 3-3 of FIG. 1; and

FIG. 4 is a sectional view of the detonator assembly according to the invention taken along lines 4-4 of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, which, for purposes of simplicity, will be described together, it will be seen that the device of the invention is enclosed in an outer body 11. Outer body 11 has an inner wall 12 with a cylindrical center depression 13 extending transversely thereacross. Center depression 13 is not a necessary component of the invention but, in the developmental models, provides clearance for internal mechanisms of the delivery vehicle. Suitable side walls 14 extend vertically downward from inner wall 12 and provide container sidewalls thereabout. Inner wall 12 may be seen to have threaded bosses 15 extending upwardly therefrom and, as may be seen in FIG. 2, the threadable portion passes therethrough.

' A detonator 16 is threadably fastened within threaded boss 15 and is connected by a suitable length of shielded mild detonating cord 17. Those familiar with the pyrotechnic arts will recognize that shielded mild detonating cord is a common item in the pyrotechnic fields, however, other means of detonating detonator 16 may be employed if so desired. For example, if detonator 16 were of the electrical type, it would require electrical conduits attached thereto which, as in the case of shielded mild detonating cord 17, may advantageously be placed within thin walled metal conduit.

On the side wall 14 of ejector body 11, a threaded boss 18 extends therethrough. The purpose of threaded boss 18 is for pressure testing prior to installation in the vehicle. Such testing will be familiar to those skilled in the pyrotechnic art and is used to assure that the proper vapor pressures are present within the pyrotechnic package. A plug 19 is threadably inserted into threaded boss 18 while the device is stored or prior to pressure testing. The lower portion of side walls 14 are turned outwardly to form a marginal lip 21 which extends about the entire periphery of outer body 11. Marginal lip 21 is used in mounting the outer body 11 within the vehicle.

The main purpose of outer body 11, quite naturally, is to provide a pyrotechnic launching tube for the pyrotechnic container to be inserted therein. For this reason, outer body 11 must be quite strong although lightweight. For these reasons, stainless steel may be used, if desired. However, other materials may be used for this purpose. In selection of alternate materials, the secondary function of outer body 11 must also be considered, that is, the establishment of a moisture proof environment which is impervious to vapors which may come from the chemical material carried therein.

Pyrotechnic container 22, best shown in sectional view of FIG. 2, is suitably configured to fit within the internal recess of outer body 1 1. Pyrotechnic container 22 has a curved bottom end 23 with vertical side walls 24 extending upwardly therefrom. It will be observed that vertical side walls 24 are spaced inwardly from the edges of curved bottom end 23 such that the marginal portion thereof extends congruently with marginal lip 21 of outer body 11. I

Pyrotechnic container 22 is divided into compartments by vertically extending dividing septa 25. Each septum 25 extends the full length of pyrotechnic container 22 so as to form a plurality of spaces therein for the storage of suitable chemical material, such as pyrotechnic material 26.

The particular nature of the chemical material within container 22 depends, of course, on the application to which the invention is to be placed. For purposes of completeness and illustration, in the pyrotechnic marker application, pyrotechnic mixture 26 may be comprised of a mixture of red phosphrous, a suitable casting solvent having good ignition qualities, i.e. benzene, casted in a matrix of a suitable synthetic rubber material. Other ingredients, such as manganese dioxide, may be used in the mixture to control the burning rate thereof and powered metallic magnesium may be used as a thermal source to ensure continuous combustion. The aforesaid mixture produces an opaque visible cloud which may be seen for great distances and the burning rate permits a long duration marking of the detonation site.

If uses other than marking are contemplated, suitable chemicals may be placed in pyrotechnic mixture 26 such that the oxides and other chemical compounds thereof produce a desired smoke or residue for the particular application. Other applications may require no chemical action from the material in container, for example, the material may simply be scattered about the site or'dissolve in a water environment.

Because these applications are so varied and many in number however, and because the particular chemical material employed is considered a matter of choice in the present invention, further description thereofis not given herein.

A suitably shaped cover 27 extends over the top of pyrotechnic container 22. Suitable retaining means secure cover 27 to pyrotechnic container 22. For example, threaded cover screws 28 may be used to extend through the surface of cover 27 and be threadably received in septa 25. The marginal edges of cover 27 are turned downwardly to form a suitable cover lip 29 which extends about the periphery of cover 27 and cooperates with shoulders on vertical walls 24 of pyrotechnic container 22. The purpose of lips 29 and the cooperating shoulder in side wall 24 is to provide better hermetic sealing of pyrotechnic material 26 and strength to pyrotechnic container 22 upon ejection. The uppermost surface of cover 27 has a network of cover ridges 31 which extend upwardly therefrom. Cover ridges 31 provide structural rigidity for cover 27 as well as provide a supporting surface on the top thereof.

A suitably configured expulsion explosive 32 is supported atop ridges 31 and held in surface engagement thereby with the interior face of inner wall 12 and may also be glued thereto. Expulsion explosive 32 may be of any type state of the art sheet explosive material. The particular amount together with the weight of the loaded pyrotechnic container 22 will determine the velocity of expulsion. Since for many applications this velocity is critical, and to prevent damage to the pyrotechnic material 26 or to prevent mechanical damage to pyrotechnic container 22, the amount of explosive may be varied by cutting holes through the sheet. A suitable arrangement is shown in FIG. 2 where expulsion explosive has a rectangular hole cut through the center thereof. Location of the hole on the center has the advantage of minimizing deformation of cover 27 as well as producing a minimum of strain on the thin section caused by the cylindrical center portion 13 in inner wall 12 of ejector body 11.

Detonation of expulsion 32 is facilitated by two smaller sheets of explosive material such as shown at 33 and known as postage stamps" in the art.

To prevent shock transmitted by cover 27 from damaging pyrotechnical material 26, a suitable shock absorbent layer 34 is affixed to the underside of cover 27 in cooperative alignment between septa 25.

Pyrotechnic container 22 is attached to ejector body 11 by means of marginal lip portion 21 and curved bottom end 23. To facilitate this connection, a spacer plate 35 is placed therebetween. Spacer plate 35 is secured to ejector body 11 by suitable means such as threaded fasteners 36. Likewise, lip portion 21 and the cooperating part of curved bottom end 23 are secured with suitable fastening means such as threaded fasteners 37. Of course, the same threaded fasteners used to secure spacing plate 35 may be used, in some instances, to secure both pyrotechnic container 22 and spacer plate 35.

Within spacer plate 35, and in cooperation relation to curved bottom end 23, a flexible linear shaped charge 38 is positioned. As will be apparent to those versed in the art, shaped charge 38 servers pyrotechnic canister 22 by splitting the portion of curved bottom end 23 outwardly. To facilitate this separation, pyrotechnic container 22 may be made of a suitable light gauge lightweight metal such as aluminum or alloys thereof. Likewise apparent to those versed in the art, a timing between the detonation of linear shaped charge 38 and expulsion explosive 32 is quite critical. The control of the detonation time of these charges is accomplished by means of a controlled device 39 shown in FIG. 1.

The constructional material used in fabrication of container 22 may be varied to suit the particular application to which the device is applied. In some instances, for example, the container may include buoyant floats to keep the chemical near the surface of the water. Other applications might require the container be a chemical component in the chemical reaction, particularly in thermal reactions.

Referring now to FIG. 3, it will be seen that control device 39 comprises a hollow juction box 41. Junction box 41 threadably receives two initiators 42 which initiate the shielding mild detonating cord 17. Also threadably received in junction box 41 is a detonator 43. Detonator 43 is connected to a command line 44 which may also be shielded mild detonating cord in the illustrated examples. A booster 45, a well known explosive expedient, is centrally located within junction box 41 and is initiated by detonator 43 to in turn initiate initiators 42. A flexible shaped charge initiator 46 is also disposed within junction box 41 and positioned in cooperative relation with respect to booster 45 so as to detonate the flexible linear shaped charge 38 upon being initiated by booster 45. As will be readily perceived by those familiar with pyrotechnic arts, the time relation ship between the detonation of the flexible linear shaped charge 38 and the expulsion explosive 32 is dependent upon the length and propagation velocities of the shielded mild detonating cord 17 extending between initiators 42 and detonators 16.

Referring now to FIG. 4, the mounting of detonator 16 and threaded boss is shown in greater detail. As shown, a booster 48 is threadably received in the lower end of threaded boss 15 and is cooperatively positioned with respect to detonator 16 so as to be initiated thereby. The initiation of booster 48, in turn, causes the detonation of postage stamp explosive 33 and as previously described results in the ultimate initiation of expulsion explosive 32 to eject the canister 22 from within outer body 11. An ejection velocity of approximately 500 feet per second has proven satisfactory in the incident invention. However, for particular adaptations, other ejection velocities may be chosen by the proficient artisan.

In the marker system shown and described, command line 44 is itself detonated by the explosive warhead of the transport vehicle. However, as will be obvious to those versed in the art, other detonation systems may be employed. For example, an electrically fired detonator may replace detonator 43 and be triggered by altimeter or time signals.

For marker purposes, the pyrotechnic contained within pyrotechnic container 22 is ejected therefrom upon impact with the ground. However, in other applications, the chemical material substituted for marker pyrotechnical material 27 may remain within the canister to burn at a slower rate or, in the case of deployment in water, to slowly dissolve therein. Likewise, container 22 may be designed to assume certain aerodynamic trajectories upon release if such deployment is desired. Likewise, it should be clear that the explosive ejection force normally separates cover 27 from container 22. However, in some applications, it may be desirable that cover 27 remain in tact with container 22 and, in those instances, other retaining means than that shown would, of course, be employed.

The foregoing description is limited to the construction and operation of a single unit but it should be obvious that plural units may be employed on a single vehicle. Indeed, the entire payload of the aerial missile may consist of a plurality of units according to the invention. In some applications, the instrument package may be made of a plurality of different types of chemicals in place of pyrotechnic material 26 or a plurality of different containers 22 each containing dfferent materials from other containers 22 on the same vehicle. Similarly, container 22 may contain payloads other than chemicals of pyrotechnic. For example, it is readily foreseeable that a container 22 might be designed to cooperate with the system of the invention which would include an instrumentation package to be placed in locations otherwise inaccessible.

OPERATION For purposes of simplicity, the operation of the device of the invention shall be described as it pertains to the marking of an impact of an aerial missile. In such an operation, ejector bodies 11 are installed in the aft end of the missile and are dimensioned such as to fit be tween the tail fins thereof. Containers 22 are filled with pyrotechnic material 26 which, as previously described, is a red phosphorous based pyrotechnic saturated with benzene as a casting solvent and aid in the ignition process. Canister 22 is then covered by cover 27 which is held in place by cover screws 28 and placed within outer body 11. Command line 44 is connected to a suitable detonation device, in the case of ordnance weapons this may be the warhead of the missile itself. The missile is fired according to conventional practice and upon reaching the target the warhead explodes. The warheads explosion is transmitted to junction box 39 via command line 44 where detonator 43 is initiated and, via booster 45, initiators 42 and initiator 46 are in turn initiated. Initiator 46 initiates flexible linear shaped charge 38 to sever the outer edge of rounded bottom portion 23 of container 22. At the same time, shielded mild detonating cord 17 transmits the detonation force to detonators 16 which, in turn, initiate boosters 48, postage stamps 33, and ejector explosive 32. The gas pressure generated by explosive 32 expels container 22 from outer body Ill and causes a separation of cover 27 therefrom. Additionally, the tire ball from the explosive warhead of the missile or the propulsion gases from expulsion explosive 32 ignite the benzene and phosphorous pyrotechnic chemical mixture to cause it to combust and produce the desired smoke visual marker.

Further description of the dynamics of the combustion of the pyrotechnic material, its dispersion in the atmosphere, and other factors governing its deployment as a visual indicator are unnecessary for the understanding of the present invention. Accordingly, they are not included in detail herein but are well understood to people versed in the pyrotechnic arts.

The foregoing description taken together with the appended claims constitute a disclosure such as to enable a person skilled in the arts and having the benefit of the teachings contained therein to make and use the invention. Further, the structure herein described meets the objects of the invention and generally constitutes a meritorous advance in the art unobvious to such a skilled artisan not having the benefits of the teachings contained herein. Obviously, many modifications and variations of the present invention are possible in the light of the above teachings, and, it is therefore understood that within the scope of the disclosed inventive concept, the invention may be practiced otherwise than specifically described.

What is claimed is:

l. A delivery system for timely ejection of a payload from a carrier vehicle comprising in combination:

ejector means mounted in said vehicle for storage of said payload and timely ejection thereof; container means having an open top portion and fitted within said ejector means with the open top innermost and having a closed bottom end portion shaped to fit substantially coplanarly with the outer surface of said vehicle and including, septum means extending from the closed bottom end means upwards toward the open end thereof for dividing said container means into a plurality of compartments and for providing strength to the container means, and means on the upper edge of said septum means for positive retention of said cover means in closing engagement with said container means;

connector means extending between said container means and said ejector means for effecting a mechanical joint therebetween;

cover means releasably positioned to cover the open top of said container means for protection of the payload carried therein; explosive ejector means positioned between an inner surface of said ejector means and said cover means and held in place thereby for timely expulsion of said container means from said ejector means and for removing said cover means from the open top portion of said container means; severing means for timely releasing said mechanical joint effected by said connector means; and

control means effectively connected to said explosive ejector means and said severing means for synchronous operation thereof.

2. A delivery system according to claim 1 in which said explosive ejector means includes a laminar plate of explosive material having a hollow void extending through the center thereof and formed so as to extend about the marginal portions of the upper surface of said cover means.

3. A delivery system according to claim 1 in which said severing means includes a linear shaped explosive charge.

4. A delivery system according to claim 1 in which said container means further includes shouldered walls which engage downwardly extending marginal lip means on the aforesaid cover means.

5. A delivery system for timely ejection of a payload from a carrier vehicle comprising in combination;

ejector means mounted in said vehicle for storage of said payload and timely ejection thereof;

container means having an open top portion and fitted within said ejector means with the open top innnermost and having a closed bottom end portion shaped to fit substantially coplanarly with the outer surface of said vehicle;

connector means extending between said container means and said ejector means for effecting a mechanical joint therebetween; cover means releasably positioned to cover the open top of said container means for protection of the payload carried therein and including, downwardly extending peripheral edge portions which cooperatively engage complementally shaped depressions in the side walls of said container means, and upwardly extending ridge portions on the upper surface of said cover means shaped to abut and cooperatively engage said explosive ejector means, and fastener means extending between said cover means and said container means for joining the two together; explosive ejector means positioned between an inner surface of said ejector means and said cover means and held in place thereby for timely expulsion of said container means from said ejector means and removing said cover means from the open top portion of said container means; severing means for timely releasing said mechanical joint efiected by said connector means; and

control means effectively connected to said explosive ejector means and said severing means for synchronous operation thereof.

6. A delivery system for delivery of a combustable chemical package by means of an aerial vehicle comprising:

ejector means having an open ended container mounted within the vehicle with the open end communicating with the exterior thereof;

detonator means threadably fastened to and extending through the rear of said ejector means for detonation of propellent means therein;

container means fitting within said ejector means and having an open top end, vertical walls, and a closed bottom end including a lip extending outwardly therefrom and shaped to conform to the outer surface of the aerial vehicle for containing the combustable chemical to be delivered therein;

septum means connected to the vertical walls and closed bottom end of said container means for effectively dividing the interior of said container means into a plurality of compartments;

cover means extending across the open end of said container means for closing the top portion thereof; shock absorbing means affixed to the lower surface of said cover means for dissapation of explosive shock associated with ejection, thereby protecting the chemical payload within said container means;

rib means effectively attached to the upper surface of said cover means for providing strength and a supporting surface above said cover means;

explosive propellent means supported by said rib means and glue in cooperative relation to said detonator means when said container and cover sitioned adjacent to fastener means and the lip portion of said bottom end means for timely separation thereof; and

initiation means effectively connected to said detonator means and said linear shaped explosive charge means for synchronous activation thereof. 

1. A delivery system for timely ejection of a payload from a carrier vehicle comprising in combination: ejector means mounted in said vehicle for storage of said payload and timely ejection thereof; container means having an open top portion and fitted within said ejector means with the open top innermost and having a closed bottom end portion shaped to fit substantially coplanarly with the outer surface of said vehicle and including, septum means extending from the closed bottom end means upwards toward the open end thereof for dividing said container means into a plurality of compartments and for providing strength to the container means, and means on the upper edge of said septum means for positive retention of said cover means in closing engagement with said container means; connector means extending between said container means and said ejector means for effecting a mechanical joint therebetween; cover means releasably positioned to cover the open top of said container means for protection of the payload carried therein; explosive ejector means positioned between an inner surface of said ejector means and said cover means and held in place thereby for timely expulsion of said container means from said ejector means and for removing said cover means from the open top portion of said container means; severing means for timely releasing said mechanical joint effected by said connector means; and control means effectively connected to said explosive ejector means and said severing means for synchronous operation thereof.
 2. A delivery system according to claim 1 in which said explosive ejector means includes a laminar plate of explosive material having a hollow void extending through the center thereof and formed so as to extend about the marginal portions of the upper surface of said cover means.
 3. A delivery system according to claim 1 in which said severing means includes a linear shaped explosive charge.
 4. A delivery system according to claim 1 in which said container means further includes shouldered walls which engage downwardly exteNding marginal lip means on the aforesaid cover means.
 5. A delivery system for timely ejection of a payload from a carrier vehicle comprising in combination; ejector means mounted in said vehicle for storage of said payload and timely ejection thereof; container means having an open top portion and fitted within said ejector means with the open top innnermost and having a closed bottom end portion shaped to fit substantially coplanarly with the outer surface of said vehicle; connector means extending between said container means and said ejector means for effecting a mechanical joint therebetween; cover means releasably positioned to cover the open top of said container means for protection of the payload carried therein and including, downwardly extending peripheral edge portions which cooperatively engage complementally shaped depressions in the side walls of said container means, and upwardly extending ridge portions on the upper surface of said cover means shaped to abut and cooperatively engage said explosive ejector means, and fastener means extending between said cover means and said container means for joining the two together; explosive ejector means positioned between an inner surface of said ejector means and said cover means and held in place thereby for timely expulsion of said container means from said ejector means and removing said cover means from the open top portion of said container means; severing means for timely releasing said mechanical joint effected by said connector means; and control means effectively connected to said explosive ejector means and said severing means for synchronous operation thereof.
 6. A delivery system for delivery of a combustable chemical package by means of an aerial vehicle comprising: ejector means having an open ended container mounted within the vehicle with the open end communicating with the exterior thereof; detonator means threadably fastened to and extending through the rear of said ejector means for detonation of propellent means therein; container means fitting within said ejector means and having an open top end, vertical walls, and a closed bottom end including a lip extending outwardly therefrom and shaped to conform to the outer surface of the aerial vehicle for containing the combustable chemical to be delivered therein; septum means connected to the vertical walls and closed bottom end of said container means for effectively dividing the interior of said container means into a plurality of compartments; cover means extending across the open end of said container means for closing the top portion thereof; shock absorbing means affixed to the lower surface of said cover means for dissapation of explosive shock associated with ejection, thereby protecting the chemical payload within said container means; rib means effectively attached to the upper surface of said cover means for providing strength and a supporting surface above said cover means; explosive propellent means supported by said rib means and glue in cooperative relation to said detonator means when said container and cover means are inserted in said ejector means for timely expulsion of said container means and cover means; fastener means effectively connected between the lip portion of the closed bottom end of said container means and said ejector means for joining the two together in a unitary assembly; linear shaped explosive charge means operatively positioned adjacent to fastener means and the lip portion of said bottom end means for timely separation thereof; and initiation means effectively connected to said detonator means and said linear shaped explosive charge means for synchronous activation thereof. 